Finally found a sound driver that worked for my Tecra 500!
These files originated in one of those painful .EXEs that are hardcoded to extract direct to a floppy drive. Luckily I had one and here are the unzipped files. The original filename is: W95XTALE.EXE
Screenshot also shows device manager is all happy, as many people online have had audio issues and recommended hacks like disabling COM ports and stuff. Note that I've seen other people's screenshots of Tecra 500s where device manager lists a different sound card name.
Crystal Semiconductor CS4232, Yamaha OPL3 (YMF262), Yamaha D/A converter (YAC512)